Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fcb281d3f05430…

MALICIOUS

PDF

76.5 KB Created: 2021-03-08 03:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e6eca751c70ac8595cff08ddcdbe08b SHA-1: 11b58bde2bb365f0f753753b8379983cfd216425 SHA-256: 46fcb281d3f0543008aadce5c34845d416471a9ce9bc4d553a9ca9eb63c08902
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/123?utm_term=que+dia+%25C3%25A9+o+feriado+de+carnaval+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fe8264623a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/KPzoEgd/the_last_shelter_2_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_600c049c7f3fd.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/7b0333.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/5fac3b9a3d1145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fdf73c300492.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/dibupinazaxaj_gixozir_gepugikofurowo_nituz.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/cjeWRjb/71583358982.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/hbZDjiO/20148004520.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/pXBOgfq/temple_run_3_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/ahbhgij/easy_skateboard_tricks_to_learn_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6032c5616fc92.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/hqgcYiR/appdynamics_tutorial_for_performance_testing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_6032727303ad1.pdfIn PDF document text
    • https://rutesobob.weebly.com/uploads/1/3/1/8/131856950/jasena-nodebiv-xukub.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/hgccEhj/mci_airport_hotels.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/adding_mixed_number_fractions_worksheet_year_5.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_958633509c3b444a88d9dba511391700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/7012423854.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_e84cf62aba6d4a3b9d8a004b368ff7e0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 5424 bytes
SHA-256: 6da2f5300ba361a6e1221b4bf0f40a12001b09616c45f678dee04578c021db80
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 12260 bytes
SHA-256: 89cfd4f0f236c22e79ac6938e0e0a61c5a5376295730b641baff3a197fb679ab

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